meecrowave-core/src/main/java/org/apache/meecrowave/lang/Substitutor.java [93:171]:
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                                if (match != 0) {
                                    varName = varNameExpr.substring(0, i);
                                    varDefaultValue = varNameExpr.substring(i + match);
                                    break;
                                }
                            }

                            if (priorVariables == null) {
                                priorVariables = new ArrayList<>();
                                priorVariables.add(new String(chars,
                                        offset, length));
                            }

                            checkCyclicSubstitution(varName, priorVariables);
                            priorVariables.add(varName);

                            final String varValue = getOrDefault(varName, varDefaultValue);
                            if (varValue != null) {
                                final int varLen = varValue.length();
                                buf.replace(startPos, endPos, varValue);
                                altered = true;
                                int change = substitute(buf, startPos, varLen, priorVariables);
                                change = change + varLen - (endPos - startPos);
                                pos += change;
                                bufEnd += change;
                                lengthChange += change;
                                chars = buf.toString().toCharArray();
                            }

                            priorVariables.remove(priorVariables.size() - 1);
                            break;
                        }
                    }
                }
            }
        }
        if (top) {
            return altered ? 1 : 0;
        }
        return lengthChange;
    }

    protected String getOrDefault(final String varName, final String varDefaultValue) {
        return valueMap.getOrDefault(varName, varDefaultValue);
    }

    private int isMatch(final char[] chars, final char[] buffer, int pos,
                        final int bufferEnd) {
        final int len = chars.length;
        if (pos + len > bufferEnd) {
            return 0;
        }
        for (int i = 0; i < chars.length; i++, pos++) {
            if (chars[i] != buffer[pos]) {
                return 0;
            }
        }
        return len;
    }

    private void checkCyclicSubstitution(final String varName, final List<String> priorVariables) {
        if (!priorVariables.contains(varName)) {
            return;
        }
        final StringBuilder buf = new StringBuilder(256);
        buf.append("Infinite loop in property interpolation of ");
        buf.append(priorVariables.remove(0));
        buf.append(": ");
        appendWithSeparators(buf, priorVariables);
        throw new IllegalStateException(buf.toString());
    }

    private void appendWithSeparators(final StringBuilder builder, final Collection<String> iterable) {
        if (iterable != null && !iterable.isEmpty()) {
            final Iterator<?> it = iterable.iterator();
            while (it.hasNext()) {
                builder.append(it.next());
                if (it.hasNext()) {
                    builder.append("->");
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meecrowave-proxy/src/main/java/org/apache/meecrowave/proxy/servlet/service/SimpleSubstitutor.java [91:169]:
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                                if (match != 0) {
                                    varName = varNameExpr.substring(0, i);
                                    varDefaultValue = varNameExpr.substring(i + match);
                                    break;
                                }
                            }

                            if (priorVariables == null) {
                                priorVariables = new ArrayList<>();
                                priorVariables.add(new String(chars,
                                        offset, length));
                            }

                            checkCyclicSubstitution(varName, priorVariables);
                            priorVariables.add(varName);

                            final String varValue = getOrDefault(varName, varDefaultValue);
                            if (varValue != null) {
                                final int varLen = varValue.length();
                                buf.replace(startPos, endPos, varValue);
                                altered = true;
                                int change = substitute(buf, startPos, varLen, priorVariables);
                                change = change + varLen - (endPos - startPos);
                                pos += change;
                                bufEnd += change;
                                lengthChange += change;
                                chars = buf.toString().toCharArray();
                            }

                            priorVariables.remove(priorVariables.size() - 1);
                            break;
                        }
                    }
                }
            }
        }
        if (top) {
            return altered ? 1 : 0;
        }
        return lengthChange;
    }

    protected String getOrDefault(final String varName, final String varDefaultValue) {
        return valueMap.getOrDefault(varName, varDefaultValue);
    }

    private int isMatch(final char[] chars, final char[] buffer, int pos,
                        final int bufferEnd) {
        final int len = chars.length;
        if (pos + len > bufferEnd) {
            return 0;
        }
        for (int i = 0; i < chars.length; i++, pos++) {
            if (chars[i] != buffer[pos]) {
                return 0;
            }
        }
        return len;
    }

    private void checkCyclicSubstitution(final String varName, final List<String> priorVariables) {
        if (!priorVariables.contains(varName)) {
            return;
        }
        final StringBuilder buf = new StringBuilder(256);
        buf.append("Infinite loop in property interpolation of ");
        buf.append(priorVariables.remove(0));
        buf.append(": ");
        appendWithSeparators(buf, priorVariables);
        throw new IllegalStateException(buf.toString());
    }

    private void appendWithSeparators(final StringBuilder builder, final Collection<String> iterable) {
        if (iterable != null && !iterable.isEmpty()) {
            final Iterator<?> it = iterable.iterator();
            while (it.hasNext()) {
                builder.append(it.next());
                if (it.hasNext()) {
                    builder.append("->");
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